Kinetic Study of an Esterification by Monitoring Pitch Changes in a Cholesteric Liquid Crystal Solvent

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• The cholesteric solvent B was not the “best” solvent in terms of its α°/n value and its cholesteric temperature range. The largest value (α°/n = 16600) of α°/n for reaction system 1 was observed for the mixture of CN, CC, COC and PCPB (90:10:40; 150 weight ratio), which also showed the widest cholesteric temperature range (room temperature—95.6°C). However, in this solvent, the acid anhydride was not stable chemically at the reaction temperatures, judging from the gradual red shift of λmax with time. We therefore chose cholesteric solvent B as a reaction solvent primarily because of its chemical stability with both reactants and products. In this solvent, the reaction had to be carried out at temperatures above 45°C, because of the gradual crystallization of the solution at temperatures below 40°C. Reaction system I was then selected for further study, since the kinetics could be studied over a wider temperature range (45-65°C) than system V (45-58°C).
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